Obstreperous (12)
'obstreperous' is the definition.
(synonyms)
This is all the clue.
(Other definitions for truculent that I've seen before include "Defiantly aggressive" , "Aggressively defiant" , "Obstreperous" , "Defiant, rude" , "Quarrelsome" .)
'obstreperous' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for unmanageable that I've seen before include "Impossible to control" , "Hard to control" , "Recalcitrant" .)